... all electric parameters such as three-phase voltage (phase/line), three-phase current, active power, reactive power, ... electric parameters such as U, I, P, Q, S, PF, F and so on in three-phase ... power grid;4,Measure the voltage and current’s positive and negative sequence and zero sequence, ... interface, industrial standard ModBus protocol;10,On-line real-time display the voltage and current waveform ...